81635190243 has 16 divisors (see below), whose sum is σ = 109526016000. Its totient is φ = 54084481920.

The previous prime is 81635190233. The next prime is 81635190251. The reversal of 81635190243 is 34209153618.

It is not a de Polignac number, because 81635190243 - 2⁶ = 81635190179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81635190195 and 81635190204.

It is not an unprimeable number, because it can be changed into a prime (81635190233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507558 + ... + 648756.

It is an arithmetic number, because the mean of its divisors is an integer number (6845376000).

Almost surely, 2^81635190243 is an apocalyptic number.

81635190243 is a deficient number, since it is larger than the sum of its proper divisors (27890825757).

81635190243 is a wasteful number, since it uses less digits than its factorization.

81635190243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142402.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 81635190243 in words is "eighty-one billion, six hundred thirty-five million, one hundred ninety thousand, two hundred forty-three".